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A coat of shellac can be placed over polyurethane. You should use de-waxed shellac if you plan on placing more polyurethane on in the future.
no there is not because shellac is created by a bug.
That is the correct spelling of the word "shellac" (referring to a varnish).
The same spelling is used as a proper name by a band Shellac.
Production of Shellac records started in 1898
The Futurist - Shellac album - was created in 1997.